I really want to go with the 20x10 fronts and 20x11 rears for my 2011 SS but I am worried about the offset giving me issues lowering the car.

Am I better off going with the 20x9 fronts and 20x10 rear?

Sorry but the offsets always throw me off with wheels..

I am also running a set of GM 21's with a 295 in the rear and my car is lowered about 1 1/2 inches with no problems at all. I do auto crossing in my car and zero issues!! No rubbing. As long as you have the right offsets you should be good!! I belive these wheels come with the same specs as the GM ZL1 wheels so you should have no problems running a 20X10 up front and a 20X11 in the rear. A lowered SS like mine should have no problems as im only about 1/4 lower than my buddies ZL1. (his ZL1 is at stock factory height)

Doug told me before they will all be the same concavity throughout sizes, I was skeptical but that is what he said about a month ago. Maybe things changed and now it is different?

I also believe that is what he said. Whether it is exactly true or not, I don't know, but the offsets of the rims should help determine their concave-ness...not just the width. The 9" wide rims have a 27 offset which quite a bit more aggressive than the stock rims, which means they will stick out further, which means they should have more concave than stock....which sounds awesome to me

I also believe that is what he said. Whether it is exactly true or not, I don't know, but the offsets of the rims should help determine their concave-ness...not just the width. The 9" wide rims have a 27 offset which quite a bit more aggressive than the stock rims, which means they will stick out further, which means they should have more concave than stock....which sounds awesome to me

Only thing with that is the concaveness of the 10 and 11 inch rims, would be less I believe.

Also i think the oem ZL1 rims are less concave in the front. So would this be the same way?

While trying to figure how deep is the concavity from one wheel from another and using the dimensions of the stock SS, ZL1 and the ones listed by Factory Reproductions, I have put a drawing together to show all the dimensions. I was thinking to use this for myself, but then realized I may share this and maybe it will help some of the members here in their decision.

Doug told me before they will all be the same concavity throughout sizes, I was skeptical but that is what he said about a month ago. Maybe things changed and now it is different?

Quote:

Originally Posted by KMPrenger

I also believe that is what he said. Whether it is exactly true or not, I don't know, but the offsets of the rims should help determine their concave-ness...not just the width. The 9" wide rims have a 27 offset which quite a bit more aggressive than the stock rims, which means they will stick out further, which means they should have more concave than stock....which sounds awesome to me

Quote:

Originally Posted by AlexM

While trying to figure how deep is the concavity from one wheel from another and using the dimensions of the stock SS, ZL1 and the ones listed by Factory Reproductions, I have put a drawing together to show all the dimensions. I was thinking to use this for myself, but then realized I may share this and maybe it will help some of the members here in their decision.

If I miss anything, please let me know so that I may correct it.

The file is attached to this post.

Quote:

Originally Posted by chicagobulls

Only thing with that is the concaveness of the 10 and 11 inch rims, would be less I believe.

Also i think the oem ZL1 rims are less concave in the front. So would this be the same way?

Quote:

Originally Posted by AlexM

I am afraid it does...
Would have gone with 20x9, 20x10 but I think I will ultimately go with 20x10, 20x11 just because of the "concavity" or deeper concave style on the 11, not sure though...

Doug, can you give us an insight on this matter?

Sorry for the late reply, I reached my “bump limit” yesterday before I made a single post - go figure.

To answer the “concavity question” I placed a straight edge from one lip of a wheel to the other. I then measured the distance from the straight edge to the center of the wheel (see attached picture). The results are:

There are no 20x11 polished finished wheels on the first container and limited quantities of the 20x9 and 20x10. The balance of the polished finish wheels should arrive no later than Mid-June. As soon as we have a firm ship date I will post it.

The other finishes in all sizes are still on track to arrive the week of May 22nd.

Should I do 20x9 on all 4 corners on stock tires? Or 20x9 in front and 20x10 on back on stock tires and when its time to upgrade get a fatter rear tire?

Assuming you currently have 245/45R20 front and 275/40R20 rear you can go either way. If you are looking to install larger tires when your current set wears out I suggest the 20x9 front and 20x10 rear.

Assuming you currently have 245/45R20 front and 275/40R20 rear you can go either way. If you are looking to install larger tires when your current set wears out I suggest the 20x9 front and 20x10 rear.

A staggered set would be nice but when I have to replace my tires being able to rotate them would be nice too hmmmm

Also, the 10" rear rims with their deeper inset won't poke out much further at all than the 9" rims with their +27 offset, so the look won't be much different from the side of the car. The 10" tire would actually stick further in to the car than stock and this 9" wheel so that would be the biggest change. (fatter look from the back)

These are just my thoughts for my purpose. Others may want the staggered rims. Either way..its going to look awesome.